This one just looks like a dumb idea to me. Maybe that's why it's, "used once."
Voyager Motorcycle Conversion Kit -- Boulder, CO: converts your bike from a two wheel to a trike in a matter of minutes for long trips, then converts back to a two wheel for shorter trips or whenever you desire. Fits HD 883 Hugger, 1200 HD Sportster, or any similar size make/mod bike including Honda, Suzuki, Kawasaki, Yamaha. Used only once . White Pearl color can be painted to match your bike. Retails for $4095. Willing to sell for $2495. Call 303-513-9072.